United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for August 1, 2001

                       Headquarters Daily Report

                         AUGUST 01, 2001

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                    REPORT             NEGATIVE            NO INPUT
                    ATTACHED           INPUT RECEIVED      RECEIVED

HEADQUARTERS                           X
REGION I                               X
REGION II                              X
REGION III          X
REGION IV                              X
PRIORITY ATTENTION REQUIRED  MORNING REPORT - REGION III  AUGUST  1, 2001

Licensee/Facility:                     Notification:

Exelon Generation Company, Llc         MR Number: 3-01-0026
Byron 1 2                              Date: 07/24/01
Byron,Illinois                         SRI Via Telecon
Dockets: 50-454,50-455
PWR/W-4-LP,PWR/W-4-LP

Subject: UNIT 2C STEAM GENERATOR PRIMARY TO SECONDARY LEAKAGE

Discussion:

On July 24, 2001, the licensee informed the Senior Resident Inspector of
an identified primary to secondary leak in the Unit 2C steam generator.
The initial leak rate was approximately 2-3 gallons per day (gpd) and
slowly increased to about 6-7 gpd on August 1, 2001. The leakage was
identified by slightly elevated radiation levels at the steam jet air
ejector exhaust, the steam generator blowdown system, and the main steam
line. At this time, the leakage is very low; however, the licensee has
implemented additional grab sampling at the steam jet air ejector
exhaust. The licensee has also created a higher level of awareness with
the operators. The administrative limits for shutdown are 75 gpd leakage
or an increase of greater than 30 gpd within 1 hour. Technical
Specification limits are 150 gpd on one steam generator or 600 gpd total.

Regional Action:

The resident inspectors are monitoring the activities with support from
regional specialists.

Contact:  Ann Marie Stone            (630)829-9729
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